Saatcioglu, Murat,Alsiwat, Jaber.2009-03-232009-03-2319931993Source: Dissertation Abstracts International, Volume: 54-09, Section: B, page: 4818.9780315825918http://hdl.handle.net/10393/7922http://dx.doi.org/10.20381/ruor-7044Reinforced Concrete structures located in regions of high seismic activity are expected to develop inelastic deformations in their critical regions. Therefore, inelastic dynamic analysis is required to obtain reliable predictions of structural behavior during an earthquake. Tests on reinforced concrete elements and subassemblages have shown that anchorage slip and inelastic shear deformations can be as significant as those due to inelastic flexure, in the critical regions. Hence, a proper seismic analysis should include inelastic deformations due to anchorage slip, shear and flexure. Flexural response has been researched extensively in the past. Research on the effects of anchorage slip and shear inelasticity is scarce in the literature. The effect of anchorage slip and inelastic shear on seismic response of moment-resisting reinforced concrete frames is investigated in this study. A hysteretic model for anchorage slip is developed in the first phase of the project. The model consists of a primary curve and a set of hysteretic rules. The primary curve is developed based on assuming inelastic strain distribution along the embedded length of reinforcing bars. Considerations are given for conditions existing at interior joints, exterior joints, and column-foundation interface. Hysteretic rules are derived based on observations from available experimental data. The model is verified against a large volume of experimental data conducted on single straight and hooked bars, as well as interior and exterior joints. In the second phase of the project, the hysteretic anchorage-slip model is implemented into the nonlinear dynamic analysis program Drain 2D. A recently derived hysteretic model for shear is also implemented into the program. Two major subroutines, SLIPM and SHEARM, are added in order to trace out nonlinearity in the anchorage-slip and shear models. The program is enhanced with calculations of ductility demand and energy dissipation factors. Related input and output features of the program are also enhanced. In the final phase of the project, the enhanced computer program is used to determine the seismic response of three reinforced concrete frames that were designed for this purpose. Emphasis is placed on determining effects of individual deformation components on ductility demands and overall deformation characteristics of the frames. The effect of interaction of the fundamental period of vibration of the structure and the frequency content of ground motion are also investigated. The study shows that anchorage slip reduces flexural ductility demand by up to 42%. The amount of reduction is shown to depend on the level of inelasticity experienced by the structure. Overall behavior of the structures is not affected significantly by anchorage slip. Inelastic shear is shown to have very little effect on the behavior of the frames investigated.399 p.Engineering, Civil.Thesis